Three-dimensional shaped object, method for manufacturing same, and control program

Abstract

A three-dimensional shaped object can achieve both of a property in the case of a high dense degree and a property in the case of a low dense degree, and have a high strength. The three-dimensional shaped object includes a dense portion formed on one side so as to be dense, and a porous portion formed on an opposite side so as to be porous. The dense portion and the porous portion are formed by a reaction product of a ceramic material with a chelating agent.

1 . An artificial bone comprising:
 a dense portion formed on one side so as to be dense; and   a porous portion formed on an opposite side so as to be porous,   wherein the dense portion and the porous portion are formed by a reaction product of a ceramic material with a chelating agent.   
     
     
         2 . The artificial bone according to  claim 1 , further comprising:
 an intermediate portion formed by a reaction product of a ceramic material with a chelating agent and provided between the dense portion and the porous portion,   wherein the intermediate portion has a dense degree higher than a dense degree of the porous portion and lower than a dense degree of the dense portion.   
     
     
         3 . The artificial bone according to  claim 1 ,
 wherein the dense portion has a dense degree equal to or higher than 80%, and the porous portion has a dense degree lower than 60%.   
     
     
         4 . The artificial bone according to  claim 1 ,
 wherein the ceramic material is calcium phosphate.   
     
     
         5 . The artificial bone according to  claim 4 ,
 wherein the calcium phosphate is any one of α-tricalcium phosphate (α-TCP), β-tricalcium phosphate (β-TCP), octacalcium phosphate (OCP), and carbonate apatite.   
     
     
         6 . The artificial bone according to  claim 4 ,
 wherein the chelating agent is an organic compound having three or more phosphate groups or carboxyl groups per one molecule.   
     
     
         7 . The artificial bone according to  claim 6 ,
 wherein the organic compound is any one of etidronic acid, phytic acid, and citric acid.   
     
     
         8 . (canceled) 
     
     
         9 . The artificial bone according to  claim 1 ,
 wherein the artificial bone is a bone to be charged in a missing portion of a living bone so as to form a bone body together with the living bone,   the artificial bone includes an outer surface serving as an outer surface of the bone body, and an inner surface to be located inside the bone body, and   the outer surface is formed by the dense portion, and the porous portion forms the inner surface.   
     
     
         10 . The artificial bone according to  claim 9 ,
 wherein the inner surface formed by the porous portion is a surface adjacent to an inner surface included in the missing portion and formed by the living bone.   
     
     
         11 . The artificial bone according to  claim 1 ,
 wherein the artificial bone includes one or both of cells and growth factors.   
     
     
         12 . (canceled) 
     
     
         13 . A method for manufacturing a three-dimensional shaped object, comprising:
 a layer forming step of forming a ceramic layer, using a powder ceramic material;   a curing liquid applying step of applying, to a target region in the layer, a curing liquid including a chelating agent; and   repeating the layer forming step and the curing liquid applying step so as to form the three-dimensional shaped object by a reaction product of the ceramic material with the chelating agent in the target regions of the layers superimposed on each other,   wherein the target region includes a one-side region and an opposite-side region that become a one-side portion and an opposite-side portion respectively in the three-dimensional shaped object, and   the curing liquid applying step includes applying the curing liquid to the target region such that an amount of the curing liquid applied to each unit area in the one-side region is larger than an amount of the curing liquid applied to each unit area in the opposite-side region.   
     
     
         14 . The method for manufacturing the three-dimensional shaped object according to  claim 13 ,
 wherein the target region includes an intermediate region between the one-side region and the opposite-side region, and   the curing liquid applying step includes applying the curing liquid to the target region such that an amount of the curing liquid applied to each unit area in the intermediate region is smaller than the amount of the curing liquid applied to each unit area in the one-side region, and is larger than the amount of the curing liquid applied to each unit area in the opposite-side region.   
     
     
         15 . The method for manufacturing a three-dimensional shaped object according to  claim 13 , further comprising:
 a washing step of washing the three-dimensional shaped object after forming the three-dimensional shaped object.   
     
     
         16 . A control program for controlling a three-dimensional shaping apparatus, the control program causing a computer to execute:
 layer forming processing of causing the three-dimensional shaping apparatus to form a ceramic layer, using a powder ceramic material;   curing liquid applying processing of causing the three-dimensional shaping apparatus to apply, to a target region in the layer, a curing liquid including a chelating agent; and   processing of repeating the layer forming processing and the curing liquid applying processing so as to cause the three-dimensional shaping apparatus to form the three-dimensional shaped object by a reaction product of the ceramic material with the chelating agent in the target regions of the layers superimposed on each other,   wherein the target region includes a one-side region and an opposite-side region that become a one-side portion and an opposite-side portion respectively in the three-dimensional shaped object, and   the control program causes the computer to execute the curing liquid applying processing such that an amount of the curing liquid applied to each unit area in the one-side region is larger than an amount of the curing liquid applied to each unit area in the opposite-side region.